| Clarksville to Octeville | 4,177.87 mi (6,723.63 km) |
| Clarksville to Oignies | 4,341.56 mi (6,987.06 km) |
| Clarksville to Oissel | 4,298.05 mi (6,917.04 km) |
| Clarksville to Olivet | 4,375.28 mi (7,041.33 km) |
| Clarksville to Ollioules | 4,697.54 mi (7,559.96 km) |
| Clarksville to Olonne-sur-Mer | 4,258.42 mi (6,853.26 km) |
| Clarksville to Oloron-Sainte-Marie | 4,409.69 mi (7,096.72 km) |
| Clarksville to Onet Village | 4,514.48 mi (7,265.35 km) |
| Clarksville to Onnaing | 4,367.97 mi (7,029.57 km) |
| Clarksville to Orange | 4,618.31 mi (7,432.46 km) |
| Clarksville to Orchies | 4,351.33 mi (7,002.79 km) |
| Clarksville to Orleans | 4,374.46 mi (7,040.01 km) |
| Clarksville to Orly | 4,369.00 mi (7,031.23 km) |
| Clarksville to Ormesson-sur-Marne | 4,373.70 mi (7,038.79 km) |
| Clarksville to Orsay | 4,361.96 mi (7,019.90 km) |
